Regulator Choice - mCCR

Stephane · 19th February 2008, 18:46

Mark,

If the DS4 is used at a fixed IP, well, IP will not vary with depth.

The point is, if you plan to go really deep with a DS4, you'll have to increase the IP and thus have to change the spring for a stronger one.

divingduck · 19th February 2008, 19:50

Quote: (Originally Posted by Inspired Trainer)

If you plan on staying shallow the DS4's are adequate.

If you plan to go below 100m or so FAR better options are Aqualung Calypso or Scubapro mk2 - both are cheap/easy to service and dont offer IP boost which is preferable on a manual CCR else the o2 add valve/orifice will be over driven in deep water leading to failure or po2 creep

ive had calypso's to 180m, mr12 to 150m, mk2 to 150m all without dramas - the ds4's with or without enviro seals will be problematic as you approach 100m

hope that helps

Mark

my deepest dive was 120m with sealed ds4. runs like a champ.push the po2 at this depth really easy.
my2cents

Inspired Trainer · 19th February 2008, 19:57

Quote: (Originally Posted by divingduck)

my deepest dive was 120m with sealed ds4. runs like a champ.push the po2 at this depth really easy.
my2cents

sounds very scientific

did these champion regs push the po2 up by any chance or was it simply 'better' than before?

I would add a galvanised tremulating discombobulator...often they work in situations like these

divingduck · 19th February 2008, 20:19

Quote: (Originally Posted by Inspired Trainer)

sounds very scientific

did these champion regs push the po2 up by any chance or was it simply 'better' than before?

I would add a galvanised tremulating discombobulator...often they work in situations like these

you like the screenshoot from my shearwater gf? no probs.from fundives 40m to really fundives100m+ i use fixed ip +-13,8 bar,the flow is 0,8 liter.its a bit less i need.never had po2 hits and the flow starts never more i need
hmm but mares are not in my sponsors list

WD8CDH · 11th March 2008, 12:40

Quote: (Originally Posted by Scott)

Well.. if I go with the DS4.. shipping wouldn't be accurate as I have more then a few other items on my list of things to buy from Martin..

I'm thinking more and more about my unlisted option.. the H2Odyssey integrated pillar valve/diaphragm regulator.. but the threads don't match the LAR tanks I intend to use......

-Scott

Scott,

What is the thread on the H2Odyssey? If it is 5/8-18, 3/4-16 or 7/8-14, I can think of several interesting tanks to use with it.

WD8CDH · 11th March 2008, 12:46

Quote: (Originally Posted by Inspired Trainer)

If you plan to go below 100m or so FAR better options are Aqualung Calypso or Scubapro mk2 - both are cheap/easy to service and dont offer IP boost which is preferable on a manual CCR else the o2 add valve/orifice will be over driven in deep water leading to failure or po2 creep

Mark

Hi Mark,

Isn't the Calypso depth compensated or are you plugging the holes.

My prefered USD first stage for rebreathers is the Conshelf Arctic with the enviromental seal covered with a SS disk and no silicone oil.

**Scott** · 11th March 2008, 12:48

Quote: (Originally Posted by WD8CDH)

Scott,

What is the thread on the H2Odyssey? If it is 5/8-18, 3/4-16 or 7/8-14, I can think of several interesting tanks to use with it.

standard US scuba tank thread - 0.750-14 NPSM

Packhorse · 12th March 2008, 02:27

Quote: (Originally Posted by Inspired Trainer)

.......or Scubapro mk2 - both are cheap/easy to service and dont offer IP boost .....

Mark

What do you mean by IP boost?

The MK2 is depth compensating so its IP does increase at depth but it is not balanced ie IP will not be constant with changing tank pressure. Are you pluging these somehow?
I cant see how they can be better suited than a DS4 unless you can set them to a higher fixed IP.
Surely they would be harder to setup as a fixed IP reg.

Packhorse · 14th March 2008, 00:31

OK I have put a IP gauge on a DS4 with the hydrostatic tranmitter removed and pressurised it. It sat at 140psi. By pushing in the diaphram as far as I could it would only rise 5psi at the most.
With a flat disc under the diaphram I cant imagine it raising by more than 1 or 2 psi.
IMHO replace either the diaphram or the hydrostaic tsansmitter (or clip it) and the result will be the same.

19th February 2008, 18:46	#11 (permalink)
Stephane Hey! Ho! Let's go! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 742	Re: Regulator Choice - mCCR Mark, If the DS4 is used at a fixed IP, well, IP will not vary with depth. The point is, if you plan to go really deep with a DS4, you'll have to increase the IP and thus have to change the spring for a stronger one. __________________ Stéphane Hammer-rEvo powered!
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19th February 2008, 19:50	#12 (permalink)
divingduck New Member Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Mar 2007 Location: Austria Posts: 16	Re: Regulator Choice - mCCR Quote: (Originally Posted by Inspired Trainer) If you plan on staying shallow the DS4's are adequate. If you plan to go below 100m or so FAR better options are Aqualung Calypso or Scubapro mk2 - both are cheap/easy to service and dont offer IP boost which is preferable on a manual CCR else the o2 add valve/orifice will be over driven in deep water leading to failure or po2 creep ive had calypso's to 180m, mr12 to 150m, mk2 to 150m all without dramas - the ds4's with or without enviro seals will be problematic as you approach 100m hope that helps Mark my deepest dive was 120m with sealed ds4. runs like a champ.push the po2 at this depth really easy. my2cents
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19th February 2008, 19:57	#13 (permalink)
Inspired Trainer New Member Current Rebreather/s: Pelagian Other Rebreather/s: Pelagian Join Date: Oct 2007 Location: London Posts: 63	Re: Regulator Choice - mCCR Quote: (Originally Posted by divingduck) my deepest dive was 120m with sealed ds4. runs like a champ.push the po2 at this depth really easy. my2cents sounds very scientific did these champion regs push the po2 up by any chance or was it simply 'better' than before? I would add a galvanised tremulating discombobulator...often they work in situations like these
(Offline)

19th February 2008, 20:19	#14 (permalink)
divingduck New Member Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Mar 2007 Location: Austria Posts: 16	Re: Regulator Choice - mCCR Quote: (Originally Posted by Inspired Trainer) sounds very scientific did these champion regs push the po2 up by any chance or was it simply 'better' than before? I would add a galvanised tremulating discombobulator...often they work in situations like these you like the screenshoot from my shearwater gf? no probs.from fundives 40m to really fundives100m+ i use fixed ip +-13,8 bar,the flow is 0,8 liter.its a bit less i need.never had po2 hits and the flow starts never more i need hmm but mares are not in my sponsors list
(Offline)

11th March 2008, 12:40	#15 (permalink)
WD8CDH New Member Current Rebreather/s: MK 15.X Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Other SCR Home Build Join Date: Dec 2007 Location: NY Posts: 68	Re: Regulator Choice - mCCR Quote: (Originally Posted by Scott) Well.. if I go with the DS4.. shipping wouldn't be accurate as I have more then a few other items on my list of things to buy from Martin.. I'm thinking more and more about my unlisted option.. the H2Odyssey integrated pillar valve/diaphragm regulator.. but the threads don't match the LAR tanks I intend to use...... -Scott Scott, What is the thread on the H2Odyssey? If it is 5/8-18, 3/4-16 or 7/8-14, I can think of several interesting tanks to use with it.
(Offline)

11th March 2008, 12:46	#16 (permalink)
WD8CDH New Member Current Rebreather/s: MK 15.X Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Other SCR Home Build Join Date: Dec 2007 Location: NY Posts: 68	Re: Regulator Choice - mCCR Quote: (Originally Posted by Inspired Trainer) If you plan to go below 100m or so FAR better options are Aqualung Calypso or Scubapro mk2 - both are cheap/easy to service and dont offer IP boost which is preferable on a manual CCR else the o2 add valve/orifice will be over driven in deep water leading to failure or po2 creep Mark Hi Mark, Isn't the Calypso depth compensated or are you plugging the holes. My prefered USD first stage for rebreathers is the Conshelf Arctic with the enviromental seal covered with a SS disk and no silicone oil.
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11th March 2008, 12:48	#17 (permalink)
Scott Supporting Member Current Rebreather/s: Other CCR Other Rebreather/s: Megalodon Other CCR Join Date: Mar 2006 Location: Mendota, Virginia Posts: 162	Re: Regulator Choice - mCCR Quote: (Originally Posted by WD8CDH) Scott, What is the thread on the H2Odyssey? If it is 5/8-18, 3/4-16 or 7/8-14, I can think of several interesting tanks to use with it. standard US scuba tank thread - 0.750-14 NPSM
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12th March 2008, 02:27	#18 (permalink)
Packhorse Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jan 2008 Location: Auckland New Zealand Posts: 100	Re: Regulator Choice - mCCR Quote: (Originally Posted by Inspired Trainer) .......or Scubapro mk2 - both are cheap/easy to service and dont offer IP boost ..... Mark What do you mean by IP boost? The MK2 is depth compensating so its IP does increase at depth but it is not balanced ie IP will not be constant with changing tank pressure. Are you pluging these somehow? I cant see how they can be better suited than a DS4 unless you can set them to a higher fixed IP. Surely they would be harder to setup as a fixed IP reg. __________________ There are no stupid questions, but there are a LOT of inquisitive idiots.
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14th March 2008, 00:31	#19 (permalink)
Packhorse Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jan 2008 Location: Auckland New Zealand Posts: 100	Re: Regulator Choice - mCCR OK I have put a IP gauge on a DS4 with the hydrostatic tranmitter removed and pressurised it. It sat at 140psi. By pushing in the diaphram as far as I could it would only rise 5psi at the most. With a flat disc under the diaphram I cant imagine it raising by more than 1 or 2 psi. IMHO replace either the diaphram or the hydrostaic tsansmitter (or clip it) and the result will be the same. __________________ There are no stupid questions, but there are a LOT of inquisitive idiots.
(Offline)

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